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Rib, false
One of the last 5 pairs of ribs. A rib is said to be "false" if it does not attach to the sternum (the breast bone). All 12 pairs of ribs attach to the building blocks of the ...
Rib, floating
One of the last two ribs. A rib is said to be " floating" if it does not attach to the sternum (the breast bone) or to another rib. There are usually 12 pairs of ribs in all. Each ...
Rib, fluctuating
One of the last two ribs. A rib is said to be "fluctuating" if it does not attach to the sternum (the breast bone) or to another rib. There are usually 12 pairs of ribs in all. ...
Rib, sternal
One of the first 7 pairs of ribs. A rib is said to be a "sternal" rib or a "true" rib if it attaches to the sternum (the breast bone). All 12 pairs of ribs attach to the building ...
Rib, true
One of the first 7 pairs of ribs. A rib is said to be "true" if it attaches to the sternum (the breast bone). All 12 pairs of ribs attach to the building blocks of the spine ...
Rib, vertebral
One of the last two ribs. A rib is said to be "vertebral" if it does not attach to the sternum (the breast bone) or to another rib. There are usually 12 pairs of ribs in all. Each ...
See ribo-.
A synthetic nucleoside antiviral agent that, by its inhibitory effect on the synthesis of guanosine 5′-phosphate, inhibits both DNA and RNA synthesis; used for treatment of ...
A r.-shaped structure. [M. E. riban] - Reil r. SYN: medial lemniscus.
François, French physician, 1765–1845. See R. ganglion.
Reduction product of ribose (–CHO at position 1 of ribose reduced to –CH2OH). SYN: adonitol.
The radical of ribitol; a constituent of riboflavin.
1. Ribose. 2. As an italicized prefix to the systematic name of a monosaccharide, r. indicates that the configuration of a set of three consecutive, but not necessarily ...
SYN: psicose.
riboflavin 5′-phosphate
SYN: flavin mononucleotide.
riboflavin, riboflavine
A heat-stable factor of the vitamin B complex whose isoalloxazine nucleotides are coenzymes of the flavodehydrogenases. The daily human requirement is 1.7 mg for adult men and ...
The 1,4 cyclic furan form of ribose.
SYN: ribothymidine.
A transferase or phosphodiesterase that catalyzes the hydrolysis of ribonucleic acid. SEE ALSO: r. (pancreatic), r. (Bacillus subtilis). SYN: ribonucleinase. - RNase A r. ...
ribonucleic acid
A macromolecule consisting of ribonucleoside residues connected by phosphate from the 3′-hydroxyl of one to the 5′-hydroxyl of the next nucleoside. RNA is found in all ...
Ribonucleic acid (RNA)
A nucleic acid molecule similar to DNA but containing ribose rather than deoxyribose. RNA is formed upon a DNA template. There are several classes of RNA molecules. They play ...
SYN: ribonuclease.
A combination of ribonucleic acid and protein.
Ribonucleoprotein (RNP)
A combination of ribonucleic acid (RNA) and protein. In autoimmune diseases, antibodies can form against ribonucleoprotein. They are called anti-RNP antibodies.
A nucleoside in which the sugar component is ribose; the common ribonucleosides of RNA are adenosine, cytidine, guanosine, and uridine.
A nucleotide (nucleoside phosphate) in which the sugar component is ribose; the major ribonucleotides of RNA are adenylic acid, cytidylic acid, guanylic acid, and uridylic ...
Ribosome receptor proteins that interact specifically with the large ribosomal subunit and aid in translocation of newly synthesized proteins across the endoplasmic ...
The 1,5-cyclic form of ribose.
The pentose that, as the d-isomer, is present in ribonucleic acid; epimers of d-r. are d-arabinose, d-xylose, and l-lyxose.
Ribose phosphorylated on carbon-5; an intermediate in the pentose phosphate pathway. - ribose 5-phosphate isomerase an enzyme catalyzing interconversion of d-ribose ...
The product formed by replacement of the H of the C-1 OH of ribose by an alcohol residue (which may be another sugar); differs from ribosyl compounds and does not occur in ...
Ribosomal RNA
A molecular component of a ribosome, the cell's essential protein factory. Ribosomal RNA (rRNA) fabricates polypeptides (assemblies of amino acids that make up proteins). A tiny ...
The cell's essential protein factory. A tiny particulate structure located in the cytoplasm of the cell (outside the nucleus), the ribosome is composed of two subunits, one ...
The enhanced urinary excretion of d-ribose; commonly one manifestation of muscular dystrophy. [ ribose + G. ouron, urine]
The radical formed by loss of the hemiacetal OH group from either of the two cyclic forms of ribose (yielding ribofuranosyl and ribopyranosyl compounds), by combination with an ...
The covalent attachment of one or more ribosyl groups to a molecule (usually a macromolecule). - ADP r. covalent attachment of an ADP-ribosyl moiety to a macromolecule; ...
SYN: nebularine.
SYN: ribothymidine.
5-Methyluridine; the ribosyl analog of thymidine (deoxyribosylthymine); a nucleoside found in small amounts in ribonucleic acid s. SYN: ribofuranosylthymine, ...
ribothymidylic acid
Ribothymidine 5′-phosphate; the ribose analog of thymidylic acid; a rare component of transfer RNAs.
A corruption of riboside, by analogy with nucleoside-nucleotide, to mean ribonucleotide.
SYN: RNA virus.
An RNA molecule that can catalyze its own chemical reactions. * * * A nonprotein biocatalyst; several cleave precursors of tRNA to yield functional tRNAs; others act on rRNA; ...
The 2-keto isomer of ribose. As the 5-phosphate, it participates in the pentose monophosphate shunt; as the 1,5-bisphosphate, it combines with CO2 at the start of the ...
ribulose-1,5-bisphosphate carboxylase
A dimerizing carboxy-lyase; an enzyme that catalyzes the addition of carbon dioxide to d-ribulose 1,5-bisphosphate and the hydrolysis of the addition product to two molecules of ...
ribulose-phosphate 3-epimerase
An enzyme catalyzing the reversible interconversion of d-xylulose 5-phosphate and its epimer, d-ribulose 5-phosphate; a step in the nonoxidative phase of the pentose phosphate ...
Annibale, Italian astrophysicist, 1844–1919. See R. law.
The grain of Oryza sativa (family Gramineae), the r. plant; a food; also used, finely pulverized, as a dusting powder. [G. oryza]
Rice genome
The first commercially important plant to have its genome sequenced. This feat, completed early in 2001, is particularly important because rice is a staple food for a large ...
Arnold R., U.S. pathologist, 1893–1968. See Hamman-R. syndrome.
Barry Wyndham, 20th century English physician. See R.- Rundle syndrome.
John Clifford, Canadian neurologist, *1909. See Steele-R.- Olszewski disease, Steele-R.- Olszewski syndrome.
August G., German surgeon, 1742–1812. See R. hernia, R.- Monro line, Monro-R. line. Maurice N., U.S. pathologist, *1897. See R. syndrome.
A highly toxic lectin and hemagglutin occurring in the seeds (castor beans) of the castor oil plant, Ricinus communis; if eaten, acts as a violent irritant and may be fatal; an ...
Poisoning by ingestion of toxic principles from seeds (castor beans) or leaves of the castor oil plant, Ricinus communis.
A salt of ricinoleic acid.
ricinoleic acid
An unsaturated hydroxy acid present in castor oil.
A genus of plants (family Euphorbiaceae) with one species, R. communis, the castor oil plant, the source of castor oil; the leaves are said to be a galactagogue. SYN: castor ...
A disease of infants and children that disturbs normal bone formation (ossification). Rickets is a failure to mineralize bone. This softens bone (producing osteomalacia) and ...
Rickets, celiac
Rickets caused by failure of the intestines to absorb calcium and fat from foods.
Rickets, hypophosphatemic
A rare type of rickets in which phosphate collects abnormally in the kidneys. Treatment is with oral phosphate and vitamin D supplements.
Rickets, renal
Rickets-like bone malformations caused by prolonged inflammation of the kidneys.
Rickets, vitamin D resistant
A rickets-like condition caused by an inborn defect of metabolism, usually in males. Vitamin D cannot be absorbed, and so does not work to treat the illness.
Howard T., U.S. pathologist, 1871–1910. See Rickettsia.
A member of a group of microorganisms that (like viruses) require other living cells for growth but (like bacteria) use oxygen, have metabolic enzymes and cell walls, and are ...
Pertaining to or caused by rickettsiae.
Rickettsial diseases
The infectious diseases caused by the rickettsiae fall into 4 groups:(1) typhus: epidemic typhus, Brill-Zinsser disease, murine (endemic) typhus, and scrub typhus; (2) ...
A mild infectious disease first observed in New York City caused by Rickettsia akari, transmitted from its mouse host by chigger or adult mite bites. There is fever, a dark spot ...
The infectious diseases caused by the rickettsiae. See Rickettsial diseases.
Rickettsioses of the eastern hemisphere, tick-borne
There are 3 known diseases caused by infection with rickettsial agents. They are North Asian tick-borne rickettsiosis, Queensland tick typhus, and African tick typhus (fičvre ...
Infection with rickettsiae. - vesicular r. SYN: rickettsialpox.
Rickettsiosis, North Asian tick-borne
One of the tick-borne rickettsial diseases of the eastern hemisphere, similar to Rocky Mountain spotted fever, but less severe, with fever, a small ulcer (eschar) at the site of ...
An agent inhibitory to the growth of Rickettsia. [Rickettsia + G. statikos, bringing to a standstill]
SYN: rachitic.
Norman H., U.S. oral pathologist, *1920. See R. test.
Abbreviation for radial immunodiffusion.
George, British physician, 1888–1947. See R. phenomenon. SEE ALSO: R. phenomenon.
Samuel, English chemist and bacteriologist, 1863–1929. See R.- Walker coefficient, R.- Walker method.
1. A (usually rough) linear elevation. SEE ALSO: crest. 2. In dentistry, any linear elevation on the surface of a tooth. 3. The remainder of the alveolar process and its soft ...
Humphrey, English anatomist, 1653–1708. See R. circle, R. sinus, circulus venosus ridleyi.
Bernhard M.C.L., German surgeon, 1846–1916. See R. disease, R. lobe, R. struma, R. thyroiditis.
Hermann, German pathologist, 1858–1932. See R. cells, under cell, R. cell leukemia, R. lymphocyte.
Franz, German physician, 1843–1904. See R. pulse.
Herwigh, German ophthalmologist. See R. anomaly, R. syndrome.
Gustav, Austrian dermatologist, 1855–1943. See R. melanosis.
Abbreviation for resistance-inducing factor.
SYN: rifampin.
A first-line antituberculosis drug; a bactericidal agent used in the treatment of tuberculosis and other infections, that, like all antituberculosis drugs, must not be used alone ...
rifamycin, rifomycin
A complex antibiotic, isolated from Nocardia mediterranei, that is active against Mycobacterium tuberculosis and Staphylococcus aureus; it is poorly absorbed from the ...
Rift Valley fever
An acute, fever-causing viral disease that affects domestic animals (such as cattle, buffalo, sheep, goats, and camels) and humans that is most commonly associated with ...
Antonio, Italian physician, 1832–1919. See R.- Fede disease.
Right heart
The heart is composed functionally of two hearts — the right heart and the left heart. The right heart consists of the right atrium which receives deoxygenated blood from the ...
Right ventricle
The lower right chamber of the heart that receives deoxygenated blood from the right atrium and pumps it under low pressure into the lungs via the pulmonary artery. The tricuspid ...
SYN: dextrocular.
SYN: dextropedal.
Denoting the habitual or more skillful use of the right hand for writing and most manual operations. SYN: dextral, dextromanual.
1. Stiffness or inflexibility. SYN: rigor (1). 2. In psychiatry and clinical psychology, an aspect of personality characterized by an individual's resistance to change. 3. In ...
1. SYN: rigidity (1). 2. SYN: chill (2). [L. stiffness] - acid r. coagulation of muscle protein induced by acids. - calcium r. arrest of the heart in the fully contracted ...
Conrad M., U.S. pediatrician, *1913. See R.-Day syndrome. Harris D., Jr., 20th century U.S. physician. See Smith-R. syndrome.
A drug used to treat amyotrophic lateral sclerosis; mechanism of action not known.
A margin, border, or edge, usually circular in form. - bite r. SYN: occlusion r.. - occlusal r. SYN: occlusion r.. - occlusion r. occluding surfaces built on temporary or ...
A slit or fissure, or narrow elongated opening between two symmetric parts. [L. a slit] - r. glottidis [TA] the interval between the true vocal cords. SYN: r. vocalis, glottis ...
An antiviral agent resembling amantadine in its activity but seemingly with fewer central nervous system adverse reactions.
Rimini test
See under test.
Fissured; marked by cracks in all directions, like the crackle of porcelain. [L. rimosus, fr. rima, a fissure]
A minute slit or fissure. [L. dim. of rima]
Georg E., German physician, 1836–1908. See R. folds, under fold.
1. A circular band surrounding a wide central opening; a r.-shaped or circular structure surrounding an opening or level area. SYN: anulus [TA]. 2. The closed ( i.e., endless) ...
Ring chromosome
A structurally abnormal chromosome in which the end of each chromosome arm has been lost and the broken arms have been reunited in ring formation. A ring chromosome is denoted by ...
Ring, intrastromal corneal
A plastic ring designed to be implanted in the cornea, the transparent structure in the front of the eye. The aim of the corneal ring implant is to flatten the cornea and in so ...
A circular or oval ring with internal cutting edge, on the model of the carpenter's spoke-shave, for shaving off tumors in the nasal and other cavities. SYN: spoke-shave.
Sydney, English physiologist, 1835–1910. See R. injection, R. solution, lactated R. injection, Krebs-R. solution, Locke-R. solution, R. lactate.
Ringing in the ears
Medically called tinnitis, this can arise in any of "the four sections of the ear" — the outer ear, the middle ear, the inner ear, and the brain — and can be due to many ...
SYN: tinea. - r. of beard SYN: tinea barbae. - black-dot r. tinea capitis due most commonly to Trichophyton tonsurans or T. violaceum. - r. of body SYN: tinea corporis. - ...
Ringworm of the nails
The most common fungus infection of the nails, also called onychomycosis. Onychomycosis makes the nails look white and opaque, thickened, and brittle. Those at increased risk ...
Friedrich Heinrich A., German otologist, 1819–1868. See R. test.
Jean, French anatomist and botanist, 1577–1657. See R. anastomosis, R. arc, R. arcades, under arcade, R. bones, under bone, R. bouquet, R. muscle.
Abbreviation for radioimmunoprecipitation.
Relating to a ripa; marginal.
Louis H.A., French physician, 1807–1856. See R. sign.
Denoting progressive oxidation of dye solutions, as in the r. of hematoxylin solutions to hematein or of methylene blue to azure dyes.
Charles B., 20th century U.S. surgeon. See R. operation.
RIRS (retrograde intrarenal surgery)
Retrograde intrarenal surgery (RIRS) is a procedure for doing surgery within the kidney using a viewing tube called a fiberoptic endoscope. In RIRS the scope is placed through ...
Abbreviation for radioiodinated serum albumin.
The probability that an event will occur. - attributable r. the rate of a disease or other outcome in exposed individuals that can be attributed to the exposure. - competing r. ...
Risk factor
: Something that increases a person's chances of developing a disease.
Risk of recurrence
In medical genetics, the chance that a genetic (inherited) disease present in a family will recur in that family. The concept in general medicine means the chance that an illness ...
Samuel D., U.S. ophthalmologist, 1845–1920. See R. rotary prism.
See r. (muscle). [L. risor, a laughter, fr. rideo, pp. risus, to laugh]
Abbreviation for radioimmunosorbent test.
An antibiotic produced by the fermentation of Amycolatopsis orientalis lurida, comprising two substances; r. A and r. B; it is useful against staphylococcic and enterococcic ...
Laughter. [laughter] - r. caninus (ri′sus ka-ni′nus) the semblance of a grin caused by facial spasm, seen especially in tetanus but also in some kinds of poisoning. SYN: ...
Ferdinand A.M.F. von, German obstetrician, 1787–1867. See R. maneuver.
A sympathomimetic agent with β2-adrenergic stimulant actions, used as a uterine relaxant.
Johann W., German physicist, 1776–1810. See R. opening tetanus, R.- Rollet phenomenon.
Ritter disease
This is the scalded skin syndrome, a potentially serious side effect of infection with the Staph (Staphylococcus) bacteria that produces a specific protein which loosens the ...
In psychiatry and psychology, any psychomotor activity ( e.g., morbid handwashing) performed by a person to relieve anxiety or forestall its development; typically seen in ...
Monoclonal antibody used in the treatment of non-Hodgkin lymphoma.
Competition between two or more individuals or entities for the same object or goal. [L. rivalis, competitor, rival] - binocular r. alteration in perception of portions of the ...
Rivea corymbosa
Mexican bindweed, a plant of the family Convolvulaceae, the seeds of which were used in ceremonies by Aztec Indians in Mexico and contain lysergic acid amide, isolysergic acid, ...
River blindness
Onchocerciasis, a disease caused by a parasitic worm (Onchocerca volvulus) which is transmitted to persons by biting blackflies (buffalo gnats) that breed in fast-flowing ...
See Rivière.
José Manuel, Mexican cardiologist, *1905. See Carvallo sign, Rivero- Carvallo effect.
William H., English physician, 1864–1922. See R. cocktail.
Rivière, Riverius
Lazare (Lazarus), French physician, 1589–1655. See R. salt.
August Q., German anatomist, 1652–1723. See R. canals, under canal, R. ducts, under duct, R. gland, R. incisure, R. membrane, R. notch.
rivus lacrimalis
SYN: lacrimal pathway. [L. rivus, stream, + Mediev. L. lacrimalis, fr. L. lacrima, a tear]
Resembling rice grains. [Fr. riz, rice]
Acronym for the right lower lobe (of the lung). The right lung has three lobes: the right upper lobe (RUL), the right middle lobe (RML), and the right lower lobe (RLL). The left ...
Abbreviation for the right lower quadrant (quarter) of the abdomen. The RLQ of the abdomen contains the appendix. (By contrast, RUQ stands for the right upper quadrant, LUQ ...
Abbreviation for right mentoanterior position.
Acronym for the right middle lobe (of the lung). The right lung has three lobes: the right lower lobe (RLL), the right middle lobe (RML), and the right upper lobe (RUL). The left ...
Abbreviation for right mentoposterior position.
Abbreviation for right mentotransverse position.
Abbreviation for respiratory minute volume.
Symbol for radon.
Short for ribonucleic acid, a nucleic acid molecule similar to DNA but containing ribose rather than deoxyribose. RNA is formed upon a DNA template. There are several classes ...
RNA editing
The process in which messenger RNA (mRNA) is chemically modified ("edited") after it is synthesized (made) but before it is translated into protein.
RNA polymerase
A polymerase is an enzyme that catalyzes the joining of many smaller molecules (called monomers) to form a big molecule (a macromolecule). RNA polymerase is a unique enzyme ...
RNA splicing
SYN: splicing (2).
RNA virus
A virus in which the genetic material is RNA. The RNA may be either double- or single-stranded. There are 6 classes of viruses. The DNA viruses constitute classes I and II. The ...
RNA, messenger
A class of RNA that is the template upon which polypeptides are put together. Abbreviated mRNA.
RNA, ribosomal
A molecular component of a ribosome, the cell's essential protein factory. Ribosomal RNA (rRNA) fabricates polypeptides (assemblies of amino acids that make up proteins). A tiny ...
RNA, transfer
In cooperation with the ribosomes, transfer RNA brings (transfers) activated amino acids into position along the messenger RNA template. The abbreviation for transfer RNA is ...
Abbreviation for ribonuclease.For terms bearing this abbreviation, see subentries under ribonuclease.
RNase D
Abbreviation for ribonuclease D.
Abbreviation for ribonucleoprotein.
Abbreviation for right occipitoanterior position.
F. Ewing, U.S. prosthodontist, 1868–1960. See R. clasp.
R. See R. syndrome.
Heinrich, L.F., German gynecologist, 1814–1878. See R. pelvis.
J.B., 20th century U.S. physician. See R. syndrome.
Frank L., 20th century English anesthesiologist. See R. tube.
See Argyll R..
Robertsonian translocation
A common and significant type of chromosome rearrangement that is formed by fusion of the whole long arms of two acrocentric chromosomes (chromosomes with the centromere near ...
Pierre, French pediatrician, 1867–1950. See Pierre R. syndrome. Charles P., French physician, 1821–1885. See Virchow-R. space.
Meinhard, U.S. physician, *1909. See R. dwarfism, R. syndrome.
Brian F., 20th century British cardiologist. See R. index.
Robert, English chemist, 1884–1941. See R. ester, R. ester dehydrogenase, R.- Embden ester.
Rudolfo (Valverde), Guatemalan dermatologist, 1878–1939.
Pertaining to or characteristic of a robot, an automatic mechanical device designed to duplicate a human function without direct human operation. [Czech robot, robot, fr. robota, ...
See Mayo-R..
In statistics, the degree to which the probability of drawing a wrong conclusion from the test result is not seriously affected by moderate departures from the assumptions ...
Acronym for receiver operating characteristic, an analytic expression of diagnostic accuracy. See R. curve.
SYN: archil.
Former name for Bartonella. [H. da Rocha-Lima, Brazilian microbiologist] - R. henselae See Bartonella henselae. - R. quintana See Bartonella quintana.
Rochalimaea quintana
Now preferentially referred to as Bartonella quintana, this is an unusual rickettsial organism that can multiply within the gut of the body louse and then can be transmitted to ...
Rock (drug)
A street name given to cocaine that has been processed from cocaine hydrochloride to a ready-to-use free base for smoking. Rather than requiring the more volatile method of ...
Rocky Mountain spotted fever (RMSF)
An acute febrile (feverish) disease initially recognized in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in ...
A type of specialized light-sensitive cell (photoreceptor) in the retina of the eye that provides side vision and the ability to see objects in dim light (night vision). By ...
The rodents; the largest order of placental mammals (class Eutheria), all possessing one pair of chisel-like upper incisors for gnawing and flat-crowned premolars and molars for ...
An agent lethal to rodents. [rodent + L. caedo, to kill]
An international unit of X-radiation or gamma-radiation. (A roentgen is abbreviated R). Named for Wilhelm Roentgen who greatly expanded our diagnostic and treatment capabilities ...
A record of the heart's movements taken with the roentgenkymograph.
An apparatus for recording the movements of the heart and great vessels or of the diaphragm on a single film. It consists of a lead sheet called the grid in which are cut ...
An obsolete technique involving the recording of movements of the heart by means of the roentgenkymograph.
SYN: radiograph.
SYN: radiograph.
SYN: radiography.
A person skilled in the diagnostic or therapeutic application of roentgen rays; a radiologist.
Radiology, the science of radiation and, specifically, the use of both ionizing (like X-ray) and nonionizing (like ultrasound) modalities for the diagnosis and treatment of ...
SYN: radiometer.
Measurement of an administered therapeutic or diagnostic dose and the penetrating power of x-rays. SYN: x-ray dosimetry.
Obsolete term for fluoroscope.
Obsolete term for fluoroscopy.
Obsolete term for radiotherapy.
See röteln.
Georges Henri, French physiologist, 1860–1946. See R. reflex. Henri L., French physician, 1809–1891. See R. disease, R. murmur, bruit de R., maladie de R..
Oscar H., U.S. physician, 1857–1941. See R. sphygmomanometer.
Karl, Swiss embryologist and gynecologist, *1863. See R. stria.
Röhrer index
See under index.
Karl Freiherr von, Austrian pathologist, 1804–1878. See R. disease, R. hernia, R.- Aschoff sinuses, under sinus, Mayer-R.-Küster-Hauser syndrome.
Relating to or described by Luigi Rolando.
Luigi, Italian anatomist, 1773–1831. See R. angle, R. area, R. cells, under cell, R. column, rolandic epilepsy, R. gelatinous substance, R. tubercle, fissure of R..
The pattern of behavior that a person exhibits in relationship to significant persons in his or her life; it has its roots in childhood and is influenced by significant people ...
A psychotherapeutic method used in psychodrama to understand and treat emotional conflicts through the enactment or reenactment of stressful interpersonal events. See ...
A more soluble and less irritating derivative of tetracycline; uses and effectiveness are similar to those of tetracycline, and it may be administered intravenously or ...
1. A mass or structure in the shape of a r.. 2. The process by which a round entity is moved by a pressure gradient, as a leukocyte moves along a blood vessel wall. - iliac r. a ...
Christian F.W., German neurologist and psychiatrist, 1844–1978. See R. nucleus.
See r. bandage.
Sir Humphry D., British physician, 1862–1944. See R. rule.
Alexander, Austrian physiologist, 1834–1903. See R. stroma, Ritter-R. phenomenon.
Cecilio, Argentinian physician in Brazil, *1899. See R. sign.
C., 20th century Italian physician. See R.-Ward syndrome.
Dimitri L., Russian physician, 1861–1921. See R. blood stain.
Moritz H., German physician, 1795–1873. See R. test, R. disease, facial hemiatrophy of R., R. syndrome, R. sign.
SYN: Romberg sign.
Paul H., German bacteriologist, 1876–1916. See R. test.
A strong biting forceps for nipping away bone. [Fr. ronger, to gnaw]
A covering or rooflike structure; e.g., a tectorium, tectum, tegmen, tegmentum, integument. [A.S. hrof] - r. of fourth ventricle [TA] SYN: tegmen ventriculi quarti. - r. of ...
See roof plate.
Placement of newborn with mother, rather than in nursery, during the postpartum hospital stay.
1. The primary or beginning portion of any part, as of a nerve at its origin from the brainstem or spinal cord. SYN: radix (1) [TA]. 2. SYN: r. of tooth. 3. The descending ...
root planing
In dentistry, abrading of rough root surfaces to achieve a smooth surface.
Rooting reflex
A reflex seen in newborn babies, who automatically turn their face toward the stimulus and make sucking (rooting) motions with the mouth when the cheek or lip is touched. The ...
In neuroanatomy, nerve r. ( radicular fila). See filum. SEE ALSO: radicular fila, under filum.
Abbreviation for right occipitoposterior position.
Formation of numerous processes of erythroid cells, which in ultrathin sections appear club-shaped, associated with cytoplasmic vesicles and found in some diseases of the ...
Ropes test
See under test.
Hermann, Swiss psychiatrist, 1884–1922. See R. test.
Rorschach test
A psychological test involving inkblots. The inkblots are used to determine what a person perceives (reads into) in the enigmatic and highly ambiguous shapes. Ten standardized ...
A genus of plants including the roses (family Rosaceae); several varieties are the sources of rose oil: R. alba, cottage rose; R. centifolia, the pale rose or cabbage rose ...
A genus of plants including the roses (family Rosaceae); several varieties are the sources of rose oil: R. alba, cottage rose; R. centifolia, the pale rose or cabbage rose ...
A chronic skin disease that affects the middle third of the face with persistent redness over the areas of the face and nose that normally blush: mainly the forehead, the chin ...
Rosacea keratitis
A condition affecting the eyes in about half of all cases of rosacea. It is characterized by burning and grittiness of the eyes (conjunctivitis). If this is not treated,
Juan, U.S. pathologist, b. 1941. See R.- Dorfman disease.
A tris(aminophenyl)methyl compound; together with pararosanilin it is a component of basic fuchsin; also used as an antifungal agent.
A prostaglandin analog with protective properties for the gastric mucosa; similar to misoprostol and also used as an antiulcerative drug.
A beadlike arrangement or structure. - rachitic r. a row of beading at the junction of the ribs with their cartilages, often seen in rachitic children. SYN: beading of the ...
Sir Henry E., British chemist, 1833–1915. See Bunsen-R. law.
Edmund, German physician, 1836–1914. See R. position. Harry M., U.S. microbiologist, *1906. See R.- Waaler test.
1. Any shrub of the genus Rosa. 2. The petals of Rosa gallica, collected before expanding; used for its agreeable odor. [L. rosa] - r. hips the fruit or berries from wild r. ...
rose bengal
The sodium salt of tetraiodotetra-chlorfluorescein, used as a stain for bacteria, as a stain in the diagnosis of keratitis sicca, and in liver function tests.
Rose-Bradford kidney
See under kidney.
rosemary oil
The volatile oil distilled with steam from the fresh flowering tops of Rosmarinus officinalis (family Labiatae); used as a flavoring and in perfumery.
Ottomar, German physician, 1851–1907. See R. law, R. sign, R. test, R.-Gmelin test.
Johann C., German anatomist, 1771–1820. See R. fossa, R. gland, R. node, R. recess, R. valve, organ of R..
Curt, 20th century German psychiatrist. See Melkersson-R. syndrome. Friedrich C., German anatomist, 1780–1829. See R. canal, R. vein, basal vein of R..
Rosenthal fiber
See under fiber.
Rosenthaler-Turk reagent
See under reagent.
Roseola is a childhood illness caused by virus infection characterized by high fevers followed by a skin rash. Roseola is also formally called roseola infantum or roseola ...
Roseola infantilis
Roseola infantilis is another name for roseola, also formally called roseola infantum. The following is a brief rundown on roseola: Cause: Roseola is caused by a virus called ...
Roseola infantum
Roseola infantum is another name for roseola, also formally called roseola infantilis. The following is a brief rundown on roseola: Cause: Roseola is caused by a virus called ...
Wilhelm, German surgeon, 1817–1888. See R.- Nélaton line.
1. The quartan malarial parasite Plasmodium malariae in its segmented or mature phase. 2. A grouping of cells characteristic of neoplasms of neuroblastic, neuroectodermal, or ...

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